CIRCULAR VARIABLE FILTER
United States Patent 3442572
US Patent References:
Infrared transmitting mirror
- - 2700323
Method of producing conductive coating on a surface and the coated article
- - 2761797
Method and means for making circular variable density filters
- - 2960015
Infrared transmitting mirror
- - 2700323
Method of producing conductive coating on a surface and the coated article
- - 2761797
Method and means for making circular variable density filters
- - 2960015
Inventors:
Illsley, Rolf F.
Thelen, Alfred J.
Apfel, Joseph H.
Thelen, Alfred J.
Apfel, Joseph H.
Publication Date:
05/06/1969
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Export Citation:
Assignee:
OPTICAL COATING LABORATORY INC
Primary Class:
Other Classes:
359/589, 118/720, 359/359
International Classes:
C23C14/04; G01J3/12; G02B5/20; G02B5/28; G02B7/00; G02B5/28; C23C13/08; B41M1/12
Foreign References:
| FR1314569A |